I'm shopping for a phone and I think I've boiled it down to either the BlackJack II or Moto Q. Neither phone has WiFi, which was one of my primary criteria, but I see that I can get a WiFi card. Does anyone have any experience using one of these card with either of those phones?

I'm assuming you mean the Moto Q9 Global on AT&T, since you mentioned it in a post elsewhere. It has a microSD card slot but no miniSD card slot. There are SD and miniSD Wifi cards but microSD? Spectec is the only manufacturer I recall trying to make one, and I don't think theirs ever shipped.